129k views
5 votes
4(x + 5) + 4x + 8Which of the following is equivalent to the expressionabove?A. 4(2x + 7)B. 8(x+4)C. 5x+17D. 8x+13

User Giorgiga
by
4.3k points

1 Answer

5 votes

First, let's use the distributive property to rearrange the given expression.

According to the distributive property of multiplication:


a\cdot(b+c)=a\cdot b+a\cdot c

Then,


\begin{gathered} 4(x+5)+4x+8 \\ =4x+4\cdot5+4x+8 \\ =4x+20+4x+8 \end{gathered}

Adding similar terms:


\begin{gathered} =4x+4x+20+8 \\ =8x+28 \end{gathered}

Now, let's compare the expression with the options.

A) 4(2x+7)

Again, using the distributive property:


\begin{gathered} 4\cdot(2x+7) \\ =4\cdot2x+4\cdot7 \\ =8x+28 \end{gathered}

So, the expression is equivalent to the letter A.

Let's test letter B too.

B) 8(x+4)


\begin{gathered} 8(x+4) \\ =8\cdot x+8+4 \\ =8x+32 \end{gathered}

The expression is not equivalent.

Also, the expression is also not equivalent to C and D.

Answer: A.

User JSArrakis
by
4.9k points